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Makes it possible for all panels to be closed. Assumes\r\n   *    only one panel may be open.\r\n   * @param {boolean} options.allowMultiple Allow for multiple accordion panels\r\n   *    to be expanded at the same time. Assumes <tt>allowToggle</tt> is set to\r\n   *    <tt>true</tt>.\r\n   */\r\n  constructor(root, options = {}) {\r\n    const config = this._getConfig(options, root)\r\n\r\n    // Prepare the initial state\r\n    this._elements = { root }\r\n    this._config = config\r\n    this._state = {\r\n      activeIndex: -1,\r\n      isTransitioning: false,\r\n    }\r\n\r\n    // Traverse the DOM and initialize the rest of the state\r\n    this.update()\r\n\r\n    // Bind the event listeners\r\n    this._handleClick = this._handleClick.bind(this)\r\n    this._handleKeyDown = this._handleKeyDown.bind(this)\r\n\r\n    this.attachEvents()\r\n  }\r\n\r\n  /**\r\n   * Get configuration options from the provided object and <tt>data-*</tt>\r\n   * attributes on the root element.\r\n   * @param {object} options The configuration options\r\n   * @return {object} an object containing configuration options\r\n   */\r\n  _getConfig(options, root) {\r\n    const dataset = root.dataset\r\n\r\n    const allowToggle = !!options.allowToggle || dataset.allowToggle === \"true\"\r\n    const allowMultiple =\r\n      allowToggle &&\r\n      (!!options.allowMultiple || dataset.allowMultiple === \"true\")\r\n\r\n    return {\r\n      allowToggle,\r\n      allowMultiple,\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Collapse the specified panel\r\n   * @param {number} i The index of the panel to be collapsed\r\n   * @return {Promise} A Promise which resolves when the transition is complete\r\n   */\r\n  _collapsePanel(i) {\r\n    const trigger = this._elements.triggers[i]\r\n    const panel = this._elements.panels[i]\r\n\r\n    trigger.setAttribute(\"aria-expanded\", \"false\")\r\n\r\n    const currentHeight = panel.getBoundingClientRect().height\r\n    panel.style.height = currentHeight + \"px\"\r\n    forceReflow(panel)\r\n\r\n    panel.style.height = \"0\"\r\n\r\n    return detectTransitionEnd(panel).then(function() {\r\n      panel.style.height = \"\"\r\n      panel.classList.remove(ClassNames.PANEL_EXPANDED)\r\n    })\r\n  }\r\n\r\n  /**\r\n   * Expand the specified panel\r\n   * @param {number} i The index of the panel to be expanded\r\n   * @return {Promise} A Promise which resolves when the transition is complete\r\n   */\r\n  _expandPanel(i) {\r\n    const trigger = this._elements.triggers[i]\r\n    const panel = this._elements.panels[i]\r\n\r\n    trigger.setAttribute(\"aria-expanded\", \"true\")\r\n\r\n    panel.classList.add(ClassNames.PANEL_EXPANDED)\r\n    const targetHeight = panel.getBoundingClientRect().height\r\n    panel.style.height = \"0\"\r\n    forceReflow(panel)\r\n\r\n    panel.style.height = targetHeight + \"px\"\r\n\r\n    return detectTransitionEnd(panel).then(function() {\r\n      panel.style.height = \"\"\r\n    })\r\n  }\r\n\r\n  /**\r\n   * Handle the click event for accordion headers\r\n   * @param {MouseEvent} e The event to be handled\r\n   * @param {number} i The index of the corresponding accordion group\r\n   */\r\n  _handleClick(e) {\r\n    const trigger = e.target.closest(Selectors.TRIGGER)\r\n    if (!trigger) {\r\n      return\r\n    }\r\n\r\n    const groupIndex = this._elements.triggers.indexOf(trigger)\r\n    this.togglePanel(groupIndex)\r\n  }\r\n\r\n  /**\r\n   * Handle the keydown event for accordion headers\r\n   * @param {KeyboardEvent} e The event to be handled\r\n   * @param {number} i The index of the corresponding accordion group\r\n   */\r\n  _handleKeyDown(e) {\r\n    const { keyCode, target } = e\r\n\r\n\r\n    const trigger = target.closest(Selectors.TRIGGER)\r\n    if (!trigger) {\r\n      return\r\n    }\r\n\r\n    const { triggers } = this._elements\r\n    const currentIndex = triggers.indexOf(trigger)\r\n\r\n    if (keyCode == Keys.ENTER || keyCode == Keys.SPACE) {\r\n      // Expand/collapse the associated panel\r\n      this.togglePanel(currentIndex)\r\n\r\n      e.preventDefault()\r\n      e.stopPropagation()\r\n    } else {\r\n      const groupCount = triggers.length\r\n      let nextIndex\r\n\r\n      switch (e.keyCode) {\r\n        case Keys.END:\r\n          // Move focus to the last accordion header\r\n          nextIndex = toggleCount - 1\r\n          break\r\n\r\n        case Keys.HOME:\r\n          // Move focus to the first accordion header\r\n          nextIndex = 0\r\n          break\r\n\r\n        case Keys.DOWN:\r\n          // Moves focus to the next accordion header\r\n          nextIndex = (groupCount + currentIndex + 1) % groupCount\r\n          break\r\n\r\n        case Keys.UP:\r\n          // Move focus to the previous accordion header\r\n          nextIndex = (groupCount + currentIndex - 1) % groupCount\r\n          break\r\n      }\r\n\r\n      if (typeof nextIndex !== \"undefined\") {\r\n        this._elements.triggers[nextIndex].focus()\r\n        e.preventDefault()\r\n        e.stopPropagation()\r\n      }\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Re-initialize the accordion. You may call this method after manual DOM\r\n   * manipulations such as adding or removing panels.\r\n   */\r\n  update() {\r\n    if (this._state.isTransitioning) {\r\n      return\r\n    }\r\n\r\n    const root = this._elements.root\r\n    const config = this._config\r\n    let activeIndex = this._state.activeIndex\r\n\r\n    const triggers = [].slice.call(root.querySelectorAll(Selectors.TRIGGER))\r\n    const panels = [].slice.call(root.querySelectorAll(Selectors.PANEL))\r\n\r\n    if (triggers.length !== panels.length) {\r\n      throw new Error()\r\n    }\r\n\r\n    for (let i = 0; i < triggers.length; i++) {\r\n      const trigger = triggers[i]\r\n      const panel = panels[i]\r\n\r\n      let isExpanded = trigger.getAttribute(\"aria-expanded\") === \"true\"\r\n      if (!config.allowMultiple && isExpanded) {\r\n        if (activeIndex !== -1) {\r\n          // Make sure that only one panel is expanded\r\n          isExpanded = false\r\n        } else {\r\n          activeIndex = i\r\n        }\r\n      }\r\n\r\n      // Make sure proper classes are applied\r\n      if (isExpanded) {\r\n        panel.classList.add(ClassNames.PANEL_EXPANDED)\r\n      } else {\r\n        panel.classList.remove(ClassNames.PANEL_EXPANDED)\r\n      }\r\n    }\r\n\r\n    if (triggers.length > 0) {\r\n      if (!config.allowToggle) {\r\n        if (activeIndex < 0 || activeIndex >= triggers.length) {\r\n          // Make sure at least one panel is expanded\r\n          activeIndex = 0\r\n          triggers[0].setAttribute(\"aria-expanded\", \"true\")\r\n          panels[0].classList.add(ClassNames.PANEL_EXPANDED)\r\n        }\r\n      } else if (activeIndex >= triggers.length) {\r\n        activeIndex = -1\r\n      }\r\n    } else {\r\n      activeIndex = -1\r\n    }\r\n\r\n    root.setAttribute(\"data-accordion-initialised\", \"true\")\r\n    this._elements.triggers = triggers\r\n    this._elements.panels = panels\r\n    this._state.activeIndex = activeIndex\r\n  }\r\n\r\n  /**\r\n   * Toggle the specified panel\r\n   * @param {number} The index of the panel to toggle\r\n   */\r\n  togglePanel(i) {\r\n    if (i < 0 || i >= this._elements.panels.length) {\r\n      return\r\n    }\r\n\r\n    if (this._state.isTransitioning) {\r\n      return\r\n    }\r\n\r\n    if (!this._config.allowToggle && this._state.activeIndex === i) {\r\n      // Configuration requires one panel to be expanded at all times\r\n      return\r\n    }\r\n\r\n    const trigger = this._elements.triggers[i]\r\n    const isExpanded = trigger.getAttribute(\"aria-expanded\") === \"true\"\r\n    const isDisabled = trigger.getAttribute(\"aria-disabled\") === \"true\"\r\n\r\n    if (isExpanded && isDisabled) {\r\n      // The panel isn't permitted to be collapsed\r\n      return\r\n    }\r\n\r\n    this._state.isTransitioning = true\r\n\r\n    if (this._config.allowToggle) {\r\n      if (isExpanded) {\r\n        this._collapsePanel(i).then(() => {\r\n          if (!this._config.allowMultiple) {\r\n            this._state.activeIndex = -1\r\n          }\r\n          this._state.isTransitioning = false\r\n        })\r\n      } else {\r\n        this._expandPanel(i).then(() => {\r\n          if (!this._config.allowMultiple) {\r\n            this._state.activeIndex = i\r\n          }\r\n          this._state.isTransitioning = false\r\n        })\r\n      }\r\n    } else {\r\n      Promise.all([\r\n        this._collapsePanel(this._state.activeIndex),\r\n        this._expandPanel(i),\r\n      ]).then(() => {\r\n        this._state.activeIndex = i\r\n        this._state.isTransitioning = false\r\n      })\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Attach all event listeners\r\n   */\r\n  attachEvents() {\r\n    const { root } = this._elements\r\n    root.addEventListener(\"click\", this._handleClick, false)\r\n    root.addEventListener(\"keydown\", this._handleKeyDown, false)\r\n  }\r\n\r\n  /**\r\n   * Detach all event listeners\r\n   */\r\n  detachEvents() {\r\n    const { root } = this._elements\r\n\r\n    root.removeEventListener(\"click\", this._handleClick, false)\r\n    root.removeEventListener(\"keydown\", this._handleKeyDown, false)\r\n  }\r\n\r\n  /**\r\n   * Initialize all accordions on the page.\r\n   */\r\n  static initAll() {\r\n    const accordions = document.querySelectorAll(Selectors.ROOT)\r\n    ;[].forEach.call(accordions, function(el) {\r\n        if (el.hasAttribute('data-accordion-initialised') === false || el.getAttribute('data-accordion-initialised') !== 'true') {\r\n            new Accordion(el)\r\n        }\r\n    })\r\n  }\r\n}\r\n\r\ndocument.addEventListener(\r\n  \"DOMContentLoaded\",\r\n  function() {\r\n    Accordion.initAll()\r\n    const callback = function(mutationsList) {\r\n      for (let i = 0, len = mutationsList.length; i < len; i++) {\r\n        if (mutationsList[i].type == \"childList\") {\r\n          Accordion.initAll()\r\n          break\r\n        }\r\n      }\r\n    }\r\n    const observer = new MutationObserver(callback)\r\n    const config = {\r\n      childList: true,\r\n      subtree: true,\r\n    }\r\n\r\n    if (document.getElementById(\"root\") != null) {\r\n      observer.observe(document.getElementById(\"root\"), config)\r\n    }\r\n    else if(document.querySelector('main') != null) {\r\n      observer.observe(document.querySelector('main'), config)\r\n    } \r\n  },\r\n  false\r\n)\r\n"],"sourceRoot":""}